I tend to assume that people are intelligent enough to figure out the obvious, like the fact that the one example I stated was not the only possible thing he could do to his car.
To the OP, do a search, there are literally hundreds of things you could do.

also have a fuel air ratio gauge. idk if that helps any and what should it be ticking at. yes i have a car that i dont know much of anything about other than its quick and the guy who had it before me did the work. i bought the car as is to keep from having to do a engine swap ect.

First is there any thing i can use to seal a gas leak i believe its coming from the piping from the actual gas nozzlle if that makes sence. the first picture the gas is leaking out of the edge not running down.. Please help

Second could a leak in my exhaust piping picture shown where it is leaking cause a back fire or a suction threw my exit on the exhaust.

for a leaking gas tank, JB weld is a fan favorite, but it is the equivalent of duct taping a hole in a vent...it's a good quick fix that you're probably going to have to fix multiple times and eventually end up replacing it. replacing a gas tank is not nearly as complex as it might sound, and is a very common learning task for someone just getting into cars.

I'm not really sure where you see a leak in that exhaust. I really dont see anything.

You can get UV dye and light from your local auto store and throw a bottle of it in your gas tank (make sure it's the gas type!). Then most of the plating around the piping down to the tank is easily removable and you should be able to see where it's coming from. There's no way around the fact that you're going to get dirty and crawl under your car! Just make sure you properly support it with jack stands and make sure the car can't roll!

Is your exhaust "custom" welded by someone other than an exhaust shop? I've seen some really bad hack jobs, my exhaust was leaking pretty bad when I got the Civic but that didn't cause any backfire issues. Are you sure it's leaking?